Liquid pressure control unit



March 3, 1936. w RPHY 2,032,885

LIQUID PRESSURE CONTROL UNIT Filed Feb. 20, 1955 4 Sheets-Sheet 1 28 2,9 16 GD GD 89 i 17 GD 11). 1

I GD 7 39 Thomas 1 v ATTORNEY E L March 3, :1936. T. w. MURPHY LIQUID PRESSURE CONTROL UNIT Filed Feb. 20, 1955 4 Sheets-Sheet 2 )NVENTQR Th masWMur/r ATTORNEY March 3, 1936. T. w. MURPHY LIQUID PRESSURE CONTROL UNIT 4 Sheets-Sheet 3 Filed Feb. 20, 1955 INVENTOR I Thomas WMur h A ORNEY M h 3, 193 T. w. MUR PHY 2,032,885

LIQUID PRESSURE CONTROL UNIT- Filed Feb. 20, 1955 4 Sheets-Sheet 4 I IN VENTOR f ing designed to op Patented Mar. 3, 1936 LIQUID PRESSURE CONTROL UNIT ThomasW. Murphy, Bala-Cynwyd, Pa, assignor to Monarch Manufacturing Works,

Inc... Philadelphia, Pa., a corporation of Delaware Application February 20, 1935, Serial No. 1,317

I 9 Claims.

This invention relates to a liquidpressure control unit, and particularly to the type wherein the liquid is first filtered, then raised to the required pressure, and then when a predetermined pressure is atta'ned, passed to the element for which it is intended, while the excess liquid is either returned to the source of supply or to the vacuum side of the pressure device. The unit, therefore, has a filter, a pump, a regulating valve, and a by-pass valve all housed in .a unitary casing. In the present instance the device will be explained as a pressure control apparatus for use with the usual oil burner, but its functions are not intended to be limited thereby.

An object of the invention is to provide a unitary casing housing all the necessary ele ments for oil burner control.

A second object is to provide such an apparatus wherein the regulating or burner flow valve and excess by-pass valves are on opposite sides of the casing and in which the operating parts are interchangeable, thereby permitting these valves to be at the desired sides of the casing without any casing change.

Another object of the invention is to provide for the optional flow of excess liquid either to the source of supply or to the vacuum side of the pump.

Another object is to provide a unit having few parts which" may be readily assembled, and which,

when adjusted; are unlikely to become faulty in operation.

According to the invention the liquid pressure control unit comprises a single casing having an inlet, a vacuum chamber into which liquid is drawn by the action of a pump extending into said casing, a filter basket through which the liquid must pass before entering'the pump, a pressure outlet from the pump divided so that its branches extend to opposite sides of said casing and into valve chambers, valves in said chambers, one of said valves being arranged to open at a predetermined pressure to permit liquid to be delivered therefrom, and the other valve bewhen a certain predetermined higher pressure is attained to by-pass the excess liquid either to the source of supply or to the vacuum side of the pump; The valve chambers are identical so that the delivery valve and excess by-pass valve may be disposed on either side'of the casing as desired.

The drawings illustrate an embodiment of the invention and the views therein areas follows:

Fig. 1 is a top plan view of the unit, showing a part of the pump broken away.

Fig. 2 is a front elevation of the same.

Fig. 3 is a cross sectional view taken on the line A-B of Fig. 1.

Fig. 4 is a vertical sectional view taken on the line C-D of Fig. 2.

5 Fig. 5 is an oifset vertical sectional view taken on the line C-Eof Fig. 2.

Fig. 6 is a. partial vertical sectional view on the line F-G of Fig. l, and shows the arrangement when excess oil is being returned to the 10 source of supply.

Fig. 7 is a fragmentary vertical sectional view taken on the line HK of Fig. 1.

Fig. 8 is line F-G a vertical sectional view taken on the of Fig. 1 with the ball and spring 15 omitted and a plug placed in the by-pass passage at the bottom thereof and shows the arrangement when liquid is being returned to the vacuum side of the pump.

Fig. 9 line A-B of Fig. 1

of coring when the pump rotation is the reverse of that shown in Fi 3.

Fig. 10is a view similar to Fig. 3 and illustrates.

is a fragmentary cross section on the b and shows the arrangement the use of bellows diaphragms in place of pis- 5 tons.

Fig. 11 is a fragmentary part of a top plan view and shows another manner of controlling the passage from the upper part .of the valve casing to the vacuum chamber.

Fig.12 is a vertical section on the line F-G of Fig. 11. i

Fig. 13 is a top plan view the delivery valve. s

Fig. 14 is a side elevation of same. As illustrated'in comprises of the unit used 111 plained.

Above the extensions l6 and I1 and extending out from the valve sleeves are and are provided with ing in enlarged bores 26 and 21, the outer ends of which are tapped to receive screw plugs 28 and 29.

The bores 26 and 21 are provided with passageways 3| and 32, communicating with said bores andvwith the vacuum chamber, plained.

as later exthe drawings, the casing ll the body 12 with valve sleeves I3 and lugs l8 and I9. 45 These lugs have openings 2| and 22 extending in to the interior of the valve sleeves l3 and l4 seats 23 and 24, terminatsmall passage 8 i The rear of the body has a bore 88 into which a pump 34 is forced, the flange 88 of said pump fitting against the shoulder 81 of said casing. The pump is of any suitable type, and nothing herein is claimed in connection with the pump per se.

In oil burning systems the pump may 'be rotated either in clockwise or counter-clockwise direction and the casing herein illustrated may be employed in either event with slight modifications hereinafter explained.

Referring now to Fig. 2, the body is provided with ribs 38 and 38 which extend from front to back of said casing and up the rear thereof, as shown in Fig. 3, and one of these ribs is cored out to provide a passageway 4i which communicates at the rear of the casing with the vacuum side of the pump as illustrated in Fig. 5.

The pump discharges through an opening 42 (see Fig. 3) and the rib 48 (see Fig. l) is cored out to provide the passageway 44 (see Fig. 3) which communicates with each of the valve sleeves i8 and i 4 at a point near the bottom of same.

The front of the body l2 has an enclosing plate 48 and with gaskets 41 binds the flange 48 of a filter basket 48therebetween. These parts are secured in place by means of the bolts 8i shown in Figs. 1 and 2.

The filter basket 48 is substantially circular in shape and its diameter is a little less than the diameter of the vacuum chamber 52.

The vacuum chamber 82 is provided with a plug 53 which may be removed if it is desired to employ a-vacuum gauge. I

The passageway 44 is provided with an opening 54 leading to a drilled and tapped hole 58 in which'a screw plug 51 is inserted and which may be removed for the p p se of inserting a pressure gauge.

As hereinbefore explained, the valve sleeves" and i4 are identical, and in the present instance the delivery or regulating valve has been shown at the right hand side and the excess by-pass valve at the left hand side of the'casing. Each of these valve sleeves isprovlded with a machined sleeve 68, which is forced into position and provides a cylinder for a piston.

Referring now to Fig. 3, thebottom of the sleeves I 3 and I 4 are threaded asfat 88 and nuts 59 and 59' are screwed into same. The interior of each sleeve hasa larger diameter above the threadedportion 58. The delivery valve sleeve nut 59' is shown in detail in Figs. 13 and 14. This nut has a threaded outlet 6! which leads into a opening into an enlarged chamber 68. Near the top'ofithis chamber the wall'thereof is provided with an annular groove 68' for receiving a split ring 88 when the valve stem 651s in position in the chamber. The valve stem has a collar 65 and a needle point II, which normally sits in the seat 88. Between the collar 85' and the bottom of the chamber 88 is a spiral lifting'spring III for raising said valve, as later explained. The top of the nut 58' is smaller than the threaded part thereof and has a wide saw cut 1 I across the same to admit liquid to the chamber 80.

The valve sleeve I 4 has a piston 88 which normally leans against the top of the valve stem 85 and thus keeps the needle H properly seated in the seat 86.

The nut 59 in the bottom of the excess by-pass valve sleeve l3 has a threaded outlet-82 and this outlet leads into a passageway 64 provided at its upper end with a seat 61.

The piston 12 in the valve sleeve i3 is provided with an integral needle valve I3 which extends into the seat 61 and a passageway 14 leads from the apex of this needle valve directly through the piston and communicates with the area above the same.

Each of the valve sleeves is provided. with an internal threaded portion 16 at the upper end of the same and into this, a nut 11 is threaded This nut has an externally threaded extension 18 and is provided with a regulating screw 19, which extends through said nut and bears by its lower end on a spring seat 8| on the top of a spiral spring whose bottom end rests on the piston in each of the valves.

The spring in the valve sleeve I3 is characterized by the numeral 82, and that in the other valve sleeve by the numeral 83.

The extension 18 has a cap 84 fitting over the same to prevent maladjustment of the regulating screw and to preventany seepage of liquid from around said screw.

In Fig. 3 the by-pass opening 62 is shown without a plug and it is intended that a pipe shall be threaded into the same, leading directly to the source of liquid supply. When the valve is thus used, the bore 26 is arranged as shown in Fig.

, 6, i. e. a ball 86 rests within the seat 23, and aspiral spring 81 engages the same, and the-screw plug 28 holds said ball firmly in said seat and prevents the passage of any liquid through the opening 2| and passageway 3|, which lead to the vacuum side of the'pump.

When, however, it is desired to by-pass liquid to the vacuum side of the pump through opening 2i and passageway 3|, the ball 86 and spring 81 are omitted and a screw plug 88 (see Fig. 8)

is screwed into the by-pass outlet 82.

The ball and spring may be eliminated by employing the arrangement shown in Figs. 11 and 12, where the lugs l8 and I8 are drilled so that the hole 28 breaks thewall of the valve sleeve to provide an opening 28' for the admission of liquid. Beyond the hole 20 there is a smaller hole 25 drilled into the vacuum chamber, and this hole is tapped. The outer end of the hole 20 is;

drilled and tapped to receive a pipe from the source of liquid supply. In Fig. 2 the extension I! on the right hand side of the casing .is utilized for the inlet port 88 because we will assume that the piping is arranged so as to more conveniently connect with this side of the casing.

The operation .of the device with parts arranged'as described is as follows: liquid admitted from the inlet opening 89 passes into the vacuum chamber 52 and through the filter basket 48 into the convex inner side 8| of the enclosing plate 46,,

thence into the passageway 4| which passes along the bottom of the casing and extends up the rear of the same, communicating with the suction side of the pump. It will thus be seen that the liquid entering from the inlet port 88 will always be under vacuum and will therefore be drawn through the wire gauze filter basket to restrain particles of dirt or solid matter from being to the vacuum chamber may be cleansed to remove the foreign matter by unscrewing the plug 92 in the bottom of the casing. I

Liquid under pressure is discharged from the pump through the opening 42 ,into the passageway 44. This passageway, as will readily beseen from an inspection of Fig. 3, extends into both of the valve sleeves i3 and i4 so that liquid is admitted under the piston in the valve casing [4, and 12 in the valve casing I3.-

Let us assume that the regulating screw 19 of the-valve sleeve H has been so adjusted that the tension exerted by the spiral spring 83 will require 60 pounds pressure to be overcome.

Let us also assume that the regulating screw 19 in the'valve sleeve I3 has been so adjusted thatlt will require 100 pounds pressure to overcome the tension of the spring 82. These pres-- sures are merely arbitrary and are used only for the purpose of explanation.

When the pressure of the liquid under the' piston 69 has reached 68 pounds, the tension of the spring 83 being thereby overcome, the' said piston 69 will be'raised, and the spiral spring 10 will then raise the valve stem 85, withdrawing I the needle valve H from the seat 86 and permitting the liquid to flow throughthe passageway 8 I and the outlet 6 I. This outlet in the ordinary oil burner system is connected to the burner nozzle of the furnace.

Any liquid which seeps around'the piston 68 will pass above the same and-throughpassageway 32 which connects with the vacuum chamber, so that no pressure can ever be built up by the liquid above the piston.

As the pressure in the passageway 44 continues to increase it exerts pressurebeneath the piston 12 in the valve sleeve l3 and when it reaches 100 pounds it overcomes the tension of the spring 82, raising the piston and the needle valve I3 from the seat 61. The operation of this valve will first be explained from Figs. 3, 6 and '7. As the needle valve 13 rises it opens the passageway 64 and allows excess liquid to passdownward through the by-passoutlet 62 back to the source of supply. This outlet 62 is, of course, at approximately atmospheric pressure, so that the passageway 14, extending through the piston 12, will prevent the building up oi any liquid pressure above the piston 12. It is also true that when the valve is closed any liquid which seeps past the piston will pass down through the passageway 14 and 64 and through the outlet 62.

When it is desired to omit the pipe from the outlet 82 to the source, the valve is arranged as shown in Fig. 8, or in Figs. 11 and 12 with the plug 25' omitted or withdrawnj The plug 88 closes the by-pass outlet 62 and the ball 68 and spring '81 having been removed, the excess liquid, when the piston 12 is raised, will'pass up through the passageway 14, through the opening 2| into the bore 28 andthence through the passageway 3| communicating with the vacuum chamber.

. In like manner the plug 25" inFigsQIl and .12'

maybe removed and liquid permitted to pass through the opening 28 and the holes 20 and25. when inserting the plug 88 (see Fig. 8) in port 82 of the nut 53 (see Figs.'3 and 10) and removing plug 28a (see- Figs.'11 and 12), port 20 then source and also in order to somewhat heat the oil by churning it through the gears of the pump, and further because 01 having this supply of oil within the basement of the home at all times, plug 25' is removed from the port 25 and the ports 28 and 62 are plugged.

Fig-10 shows the valves equipped with bellows diaphragms 93 in place of the pistons 69 and 12.

There is no casing-change here of any, kind except that the upper part of the sleeves have been drilled to provide shoulders 94 and the, threads 16 have been extended to receive lock nuts 85 which secures the flanges 96 of the diaphragms in position.

Fig. 3 shows the rib 38. cored out to provide passageway 4| for the supply of liquid to the pump, but when the pump is of the type which rotates in the opposite direction, 39 will be cored out to provide the passageway H which will function exactly as the passageway 4l. 1

It will be seen thatboth lugs l8 and is are provided with bores 26 and 21 and with-seats 23 and 24 so that either valve sleeve |3 017f|4 may ,be utilized for the by-pass valve and equipped be cored out, while in other instances the rib' 39 will be cored out, but the device itself may have the inlet on either side desired. Thevalve sleeves l3 and II with their passageways being identical, the operating parts of these valves may be interchanged at will, care, however, being taken to properly adjust the screws 18 to provide the required tension on the springs 82 and 83.

With this type of valve the by-pass valve may normally remain seated and'the maximum liquid flow through the passages GI and 6| may be equal to the pump volume less the normal skid around the pistons 69 and 12.

It will also be seen that the device is interchangeably arranged for the by-passing of excess liquid either to the source of supply or to the vacuum chamber.

It will also be apparent that liquid pressure can never be built up on the upper side of either of the pistons, first, because the upper side of the piston of the regulating -valve always communicates with the vacuum chamber, and second, because (a) when the ball 86 and spring are employed the upper side of the piston of the by-pass valve communicates with the supply tank which is at atmospheric pressure, and (b). when the plug 88 is used andthe said ball and spring omitted, the upper side of the piston oi said valve will communicate with the vacuum chamber.

Of course, the liquid pressure control'unit'herethe other rib in illustrated may be modified and changed in unitary casingwith valve housings on opposite sides of a vacuum chamber, an inlet for communication with a source of liquid fuel supply and said vacuum chamber, a pressure pump located 4 p I I aosaass in said casing between said valve housings and having its inlet connected to said chamber !or creating a vacuum therein, a filter within the vacuum chamber and surroundingthe head of 5 said pump, a valve in one housing adapted to be opened at a predetermined liquid pressure to deliver'liquid to the point or use, anda valve-in the other housing adapted to be opened at a higher predetermined liquid pressure to discharge the excessvolur'ne of liquid, said valves each hav ing a pressure chamber communicating by means oi a passage in said casing with the pressure side of said pump.

2. A liquid pressure control unit comprising a unitary casing with valve housings on opposite sides of a vacuum chamber, an inlet for communication with a source or liquid fuel supply and said vacuum chamber, a pressure pump located in said I casing between said valve housings and having its inlet connected to said chamber for creating a vacum therein, a filter within the vacuum chamher and surrounding the head or said pump, a

valve in one housing adaptedto-be opened at a predetermined liquid pressure to deliver liquid to the point of use,'a valve in the other housing adapted to-be opened at a higher predeterminedliquid pressure 'td'discharge the excess volume of liquid, said valves each having a pressure chamber I communicating'by means oi a passage in said. casing with the pressure side of said pump, passages from both valve housings to the vacuum chamber, and means for closing either of said last passages.

3. A liquid pressure control unit comprising a '35 unitary casing with valve housings on opposite sides of a vacuum chamber, an inlet for communication with a source of liquid fuel supply and said vacuum chamber,a pressure pump located in said casing between said valve housings and 40 having its inlet connected to said chamber for creating a vacuum therein, a filter within the "vacuum chamber and surrounding the head of said pump, a valve in one housing adapted to be opened at a predetermined liquid pressure to deliver liquid to the point of use, and a valve in the other housing adapted to be opened at a higher predetermined liquid pressure to discharge the excess volume of liquid, said valves each having a pressure chamber communicating by means of a passage in said casing with the pressure side of said pump, said valves being so designed that theoperating parts of same are interchange able? 4. A liquid pressure control unit having a casing provided with a vacuum chamber, an inlet through which liquid may be passed from a source or liquid supply to said chamber, a pressure pump in said casing having its inlet connected to said chamber,- a pressure regulating valve and an excess by-pass valve-in said casing, a passageway in said casing from the pressure side of the pump communicating with a pressure inlet in each valve, spring tensioned-means above the pressure inlet in'each valve, the means in said first-valve (35 having a needle normally closing adelivery opening and having'means for raising same from said opening when a predetermined pressure is attained,the means in said second valve having 1 a needle normally closing a passage leading to 7 the source of supply and adapted to be raised when a higher predetermined pressure is. at-

tained, a passage extending from the needle apex through the second'meansja' passageway leading from a point above said means to the vacuum chamber, and means for closing said passage to the source of supply to bypass .exc'ess liquid to the vacuum chamber. I 5. A liquid pressure control unit having a casing provided with a, vacuum chamber, an inlet through which liquid maybe passedtrom a source 5 of liquid supply to said chamber, a pressurepump in said casing having its inlet connected to said chamber, a filter within the vacuum chamber and surrounding a part or the head of said pump, a pressure regulating valve and an excess bypass 10 valve in said casing, said valves being on opposite sides of said casing, a passageway in said casingirom the pressure side oi the pump commu nicating with a pressure inlet in each valve, spring tensioned means abovethe pressure inlet in each valve, the means in said'first valve having a needle normally closing a delivery openingandhaving means for raising same from said opening when a predetermined pressure is attained, the means in said second valvehaving a needle nor- 20 mally closing a passage leading to the source of supply. and adaptedto be raised when a higher predetermined pressureis attained, a passage extending from the needle apex through the sec! ond means, a passageway leading irom a point 2 above said means to the vacuum chamber, and means for closing said passage to the source of I supply to bypass, excess, liquid to the vacuum, chamber.

6. A liquid pressure control unit having a cas- 30 I ing provided 'with' a vacuum chamber, an inlet through which liquid may be passed from a source of liquid supply to said chamber, a pressure pump valve'having a needle normally closing a passage 45 leading to the source ot supply and adaptedto be raised when a higher predetermined-pressure is attained, a passage extending from the needle apex through the second means, a passageway leading from a point above said means to the vacuum chamber, and removable meansior closing said lastpassageway when it is desired to by-pass the excess liquid to the source ofsupply. a I I I v 7. A liquid pressure control unit having 9. cas- 55 ing provided with a vacuum chamber, an inlet, through which liquid may be passed from a source of liquid supply to said chamber, a pressure pump, in said casing having its" inlet connected to said chamber, a filter in 60 the vacuum chamber. and surrounding a part or the head 01' said pump, a pressure regulating valve and an excess by-pass valve in'said casing, 86d valves being :on opposite sides of predetermined pressure is attained, a passage extending from the needle apex through the second means, a passageway leading from a point above said means to the vacuum chamber, and removable means for closing said last passageway when it is desired to by-pass the excess liquid to the source of supply.

8. A liquid pressure control unit having a casing provided with a vacuum chamber, an inlet through which liquid may be passed from a source of liquid supply to said chamber, a pressure pump in said casing having its inlet connected to said chamber, a filter in the vacuum chamber and surrounding a part of the head of said pump, a pressure regulating valve and an excess by-pass valve in said casing, a passageway in said casing from the pressure side of the pump communicating with a pressure inlet in each valve, spring tensioned means above the pressure inlet in each valve, the means in said first valve having a needle normally closing a delivery opening and having means for raising same from said opening when a predetermined pressure is attained, the means in said second valve having a needle normally closing a passage leading to the source of supply and adapted to be raised when a higher predetermined pressure is attained, a passage extending from the needle apex through the second means, a passageway leading from a point above said means to the vacuum chamber, and a plug in the passageway leading to the source of supply when it is desired to by-pass the excess liquid to the vacuum chamber.

9. A liquid pressure control unit having a casing provided with a vacuum chamber, an inlet through which liquid may be passed from a source of liquid supply to said chamber, a pressure pump in said casing having its inlet connected to said chamber, a filter in the vacuum chamber and surrounding a part of the head *of said pump, a pressure regulating valve and an excess by-pass valve in said casing, said valves being on opposite sides of said casing, a passageway in said casing from the pressure side of the pump communicating with a pressure inlet in each valve, spring tensioned means above the pressure inlet in each valve, the means in said first valve having a needle normally closing a delivery opening and having means for raising same from said opening when a predetermined pressure is attained, the means in said second valve having a needle normally closing a passage leading to the source of supply and adapted to be raised when a higher predetermined pressure is attained, a passage extending from the needle apex through the second means, a passageway leading from a point above said means to the vacuum chamber, and a plug in the passageway leading to the source of supply when it is desired to by-pass the excess liquid to the vacuum chamber.

THOMAS W. MURPHY. 

